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The Simian Flu, formerly known as ALZ-112 and ALZ-113, was an artificially created retrovirus designed to cure Alzheimer's disease. The brainchild of Dr. Will Rodman of the Gen-Sys Laboratories, the first virus proved a success with ape test subjects by greatly enhancing their intelligence, and managed to temporarily cure Rodman's own father. In order to make the effects permanent in humans, a second, more powerful and contagious strain was created which ultimately proved fatal to humans, leading to the Simian Flu Pandemic and the rise of the Evolved Apes.

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ALZ-112 was the codename of a viral "cure" for Alzheimer's Disease developed over the course of five-and-a-half years by geneticist Dr. Will Rodman at the Gen-Sys Laboratories. Among the chimp test subjects were Bright Eyes, Lorelei, Chambers, Burke and Verdon. A military-sanctioned "variant" of the drug was administered to Burke and Verdon, the latter of whom was later shot attempting to escape.[1] Bright Eyes displayed the desired results, and was to be exhibited during a board meeting, but was killed by security guards after she became aggressive in defence of her newborn infant, Caesar. Funding for the project was cut as a result, but Will adopted Caesar, who inherited his mother's increased intelligence. Will secretly stole samples of the 112 virus to administer to his father Charles, who was himself an Alzheimer's sufferer. Although Charles' condition initially improved, his body gradually developed antibodies against the virus, and he regressed to his former condition five years later. Desperate to create a stronger strain that would not be effected by antibodies, Will reported his unauthorized experiments to Gen-Sys head Steven Jacobs, who was impressed enough by Will's testimony to authorize the creation of the "ALZ-113".[2]

During the first trial, the virus was accidentally released onto chimpanzee handler Robert Franklin after the test bonobo Koba briefly broke out of his restraints and breached one of the viral containers and kicked off Franklin's breathing mask. Although Koba displayed the same increased intelligence possessed by apes subjected to the previous 112 variant, the new virus proved fatal to Franklin. Rodman became aware of Franklin's death, and attempted to halt the tests, but was rebuffed by Jacobs. Unknown to Rodman, Franklin had accidentally sneezed on airline pilot Douglas Hunsiker before dying, thus begining a wave of infections which would later result in a global pandemic. Will had intended to treat his father with the new ALZ-113 formula, but stopped at the last moment - this presumably could have created a second outbreak of the virus among humans. Caesar, who in the meantime had been detained in the San Bruno Primate Shelter, managed to escape his captivity and steal several cannisters containing the virus from Will's house, which he used to increase the intelligence of his cell-mates. He and his followers later escaped the Shelter, precipitating the Monkeygate scandal.[2]

The "ALZ-112" greatly increases the intelligence of non-human primates, and can be inherited by the offspring of infected apes. The only physically notable symptom is the adoption of a green tint in the infected apes' irises.[2] In contrast, the "ALZ-113" is lethal to humans. It is unknown how apes truly resist the effects of the 113, but they were known beforehand to possess amazingly strong immune systems compared to humans. Both Malakai Youmans and Natalia Kosar noted similarities between the way Simian Flu affected humans and Ebola, as both are highly contagious and have hemorrhagic fever as a primary symptom.[3]

As mentioned by Ellie, a survivor of the Simian Flu, humans that were not killed by the virus were genetically immune to the flu or else they would have died long ago so there would be no danger of the pandemic returning.

As told by Colonel McCullough in War for the Planet of the Apes, the Simian Flu has evolved to make people lose the ability to speak as big symptom of it which could push humanity's evolution back to the stone age, even people who are immune/resistant to the virus still have a chance to become infected; but there is no direct evidence given to prove this.

Two earlier versions of the script used the name "RT 112", which the producers felt was ludicrous, and "ADV 112" - shorthand for "adenovirus".

There is a set photo from the set of Dawn of the Planet of the Apes of a wall with the caption "ALZ-113" in reference of this "cure".

Unlike the ALZ-113, the ALZ-112 is not fatal to humans.

The Simian Flu is comparable to the space virus from Conquest of the Planet of the Apes where every household dog and cat were wiped out, leading to the human desire for pets which led to them taking apes as pets, then as slaves before mankind was all but wiped out by an ape revolution.

The flu was the result of finding a way to cure Alzheimer's Disease.

The Virus was created unintentionally by Dr. William Rodman, an employee of Gen-Sys.

The First person to be infected was Robert Franklin, another employee of Gen-Sys.

Its is heavily implied that the virus was dubbed the "Simian Flu" as a way of covering up its man-made origins and shifting blame of its outbreak onto the apes who were subjected to its testing.

A virus, similar to the Simian Flu may have been what caused the devolution of humans to a more primitive state of being in the original 1968 Planet of the Apes, leaving them mute and wearing animal skins, being mentally cavemen in all but name.

Humans who are immune/resistant to the original version of the Simian Flu still have a chance to become infected by mutated version of the Simian Flu; but there is no direct evidence given to prove this.